Journal of Supercritical Fluids最新文献_第9页

High-quality margarida avocado oil obtained by Sc-CO2 compared to commercial hass avocado oil from cold pressing and comparative lipid profile analysis by UPC² and GC/MS 用Sc-CO2法对冷压制得的优质牛油果油进行了比较，并用UPC²和GC/MS对牛油果油进行了脂质分析

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-15 DOI: 10.1016/j.supflu.2025.106819

Kelly Roberta Pinheiro Pantoja , Giselle Cristine Melo Aires , Sophia Aimy Oppata , João Pedro Ferraz de Carvalho , Renato Macedo Cordeiro , Raul Nunes de Carvalho Junior

{"title":"High-quality margarida avocado oil obtained by Sc-CO2 compared to commercial hass avocado oil from cold pressing and comparative lipid profile analysis by UPC² and GC/MS","authors":"Kelly Roberta Pinheiro Pantoja , Giselle Cristine Melo Aires , Sophia Aimy Oppata , João Pedro Ferraz de Carvalho , Renato Macedo Cordeiro , Raul Nunes de Carvalho Junior","doi":"10.1016/j.supflu.2025.106819","DOIUrl":"10.1016/j.supflu.2025.106819","url":null,"abstract":"<div><div>This study investigates the extraction of avocado oil from the Margarida variety using supercritical CO₂, with the aim of obtaining a product of superior quality compared to commercial avocado oil from the Hass variety, obtained by cold pressing. The quality of the oils was evaluated in terms of their physicochemical properties, composition of bioactive compounds (fatty acids, lutein, phenolic compounds, and α-tocopherol), and nutritional quality indices. Additionally, the study assessed the reproducibility of Ultra-Performance Convergence Chromatography (UPC²) compared to Gas Chromatography coupled with Mass Spectrometry (GC/MS) for the analysis of fatty acid profiles. The supercritical extraction yielded a high yield (44.90 %) and produced an oil with low levels of free fatty acids (1.04 %) and peroxides (7.03 meq/kg). The oil is rich in natural antioxidants, such as lutein (113.32 µg/g), phenolic compounds (137.75 µg GAE/g), and α-tocopherol (51.90 µg/g), and has a high concentration of beneficial fatty acids, with 44.41 % oleic acid and 28.37 % linoleic acid. With an excellent nutritional profile, evidenced by low atherogenic and thrombogenic indices. Statistical tests indicated no significant differences between the chromatographic techniques. Margarida oil demonstrates nutritional and functional properties superior to commercial Hass oil.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106819"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145364354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and formation mechanism of bimodal cell structure in TPU/PVDF foam using microwave heating foaming 微波加热发泡TPU/PVDF泡沫材料双峰胞孔结构的制备及形成机理

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-05 DOI: 10.1016/j.supflu.2025.106833

Yichong Chen , Yao Peng , Wenyu Zhong , Boda Du , Jiayang Sun , Xuwei Li , Xiaojia Wang , Dongdong Hu , Ling Zhao

{"title":"Preparation and formation mechanism of bimodal cell structure in TPU/PVDF foam using microwave heating foaming","authors":"Yichong Chen , Yao Peng , Wenyu Zhong , Boda Du , Jiayang Sun , Xuwei Li , Xiaojia Wang , Dongdong Hu , Ling Zhao","doi":"10.1016/j.supflu.2025.106833","DOIUrl":"10.1016/j.supflu.2025.106833","url":null,"abstract":"<div><div>Polymer foams offer advantages including lightweight, high resilience, excellent thermal insulation, superior sound absorption, and effective energy dissipation. Those with bimodal cell structures exhibit outstanding cyclic compression performance and comprehensive properties, garnering significant research attention. Microwave heating, as a non-conventional technique, enables rapid and uniform heating with minimal thermal gradients. Introducing materials with differential microwave energy absorption capabilities into a polymer matrix, combined with microwave heating foaming after supercritical CO<sub>2</sub> saturation at 40 ℃, 8 MPa for 8 h and slow depressurization, provides an effective route to achieve polymer foams with bimodal cells. This work utilized incompatible TPU and PVDF as the matrix. A phase separated structure was formed within the TPU/PVDF composite system due to the inherent immiscibility of the two polymers, leveraging the inherent difference in microwave energy absorption between the two polymers to create a TPU/PVDF foam with a bimodal cell structure. The extent of phase separation in the TPU/PVDF composite was investigated using SEM and EDS. Subsequently, the influence of PVDF content on the melting and crystallization behavior, rheological properties, and uniaxial tensile behavior of the TPU/PVDF composites was examined. By controlling microwave radiation power and time, various bimodal cell structures were successfully fabricated within the TPU/PVDF composites. Finally, COMSOL Multiphysics simulations were employed to model the microwave heating effects in both TPU and TPU/PVDF. These simulations demonstrated the formation mechanism of the bimodal cell structure during the foaming process of the TPU/PVDF composite. This work establishes a novel processing strategy for designing high-performance polymer foams.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106833"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145442088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Valorisation of tomato peel waste for lycopene encapsulation: Optimization and comparison of two green techniques 番茄红素包封番茄皮废弃物的研究：两种绿色工艺的优化与比较

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-10 DOI: 10.1016/j.supflu.2025.106803

Junyang Li , Chiara Bufalini , Stefania Mottola , Maria Chiara Iannaco , Roberta Campardelli , Iolanda De Marco

{"title":"Valorisation of tomato peel waste for lycopene encapsulation: Optimization and comparison of two green techniques","authors":"Junyang Li , Chiara Bufalini , Stefania Mottola , Maria Chiara Iannaco , Roberta Campardelli , Iolanda De Marco","doi":"10.1016/j.supflu.2025.106803","DOIUrl":"10.1016/j.supflu.2025.106803","url":null,"abstract":"<div><div>Lycopene, a lipid-soluble carotenoid with potent antioxidant properties, is typically found in tomato peels, which are often discarded as by-products in the food industry. This study focused on extracting lycopene using solvent extraction and encapsulating it in polycaprolactone (PCL), a biodegradable polymer, using two different methods: solvent evaporation and supercritical emulsion extraction (SEE). Both methods were used to produce microparticles for nutraceutical applications. An optimization study based on Box-Behnken design and response surface modelling was conducted to assess the effects of emulsification stirring speed, emulsification time, and polymer amount on encapsulation efficiency and particle size. Particle sizes, measured by laser diffraction, ranged between 1.77 ± 0.10 and 2.82 ± 0.17 μm for solvent evaporation, and between 1.12 ± 0.03 and 2.72 ± 0.15 μm for SEE. Encapsulation efficiencies, measured by UV–vis spectroscopy, ranged between 28.45 ± 0.28 % and 89.94 ± 1.70 % for solvent evaporation, and between 66.52 ± 0.64 % and 89.45 ± 1.31 % for SEE. Results show that SEE yields more consistent encapsulation efficiencies compared to solvent evaporation. Additionally, the design of experiments (DoE) approach helped identify optimal conditions that minimize waste and maximize productivity. This work offers a sustainable method for converting agro-industrial waste into valuable nutraceutical products.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106803"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular dynamics simulation of lanthanum(III) chloride nucleation and growth mechanisms in supercritical water 氯化镧在超临界水中成核及生长机理的分子动力学模拟

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-17 DOI: 10.1016/j.supflu.2025.106822

Xiangyu Xu , Shaokui Liu , Liang He , Shaohua Hu , Xiaoping Ouyang , Qingzhi Zhou

{"title":"Molecular dynamics simulation of lanthanum(III) chloride nucleation and growth mechanisms in supercritical water","authors":"Xiangyu Xu , Shaokui Liu , Liang He , Shaohua Hu , Xiaoping Ouyang , Qingzhi Zhou","doi":"10.1016/j.supflu.2025.106822","DOIUrl":"10.1016/j.supflu.2025.106822","url":null,"abstract":"<div><div>Supercritical water oxidation (SCWO) is a highly efficient technology for treating radioactive organic waste. However, the deposition behavior of lanthanide salts in SCWO systems remains poorly understood. In this work, molecular dynamics simulations were performed to investigate the nucleation and growth mechanisms of LaCl<sub>3</sub> in supercritical water (SCW) across a wide range of temperatures (673–1073 K) and densities (0.1–0.3 g/cm<sup>3</sup>). The nucleation and growth process can be divided into three stages: ion pairs, small ion clusters, and large ion clusters. The nucleation process was completed within 40 ps. The nucleation rate was of the order of 10<sup>30</sup> cm<sup>−3</sup>·s<sup>−1</sup>, which increased with increasing temperature and density. Under high temperature and low density conditions, the LaCl<sub>3</sub>–H<sub>2</sub>O binding energy decreased, the electrostatic interaction weakened, the hydrogen bond network was significantly destroyed, and the ion diffusion coefficient increased, which promoted the collisions and cluster formation of La<sup>3+</sup> and Cl<sup>-</sup> ions. The high charge and strong solvation effect of La<sup>3+</sup> leads to the formation of a complex three-layer solvation shell structure, which is tightly associated with Cl<sup>-</sup> ions, and the LaCl<sub>3</sub> clusters exhibit strong thermodynamic stability. This work provides a theoretical basis for solving the salt deposition problem in the treatment of radioactive organic wastewater and for the recovery of lanthanide metal elements.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106822"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Upgrading and purification of biolubricants by extraction of fatty acid methyl esters with dense CO2 浓CO2萃取脂肪酸甲酯对生物润滑剂的升级提纯

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-11 DOI: 10.1016/j.supflu.2025.106814

A. Pizzano , S.B. Rodriguez Reartes , P.E. Hegel

{"title":"Upgrading and purification of biolubricants by extraction of fatty acid methyl esters with dense CO2","authors":"A. Pizzano , S.B. Rodriguez Reartes , P.E. Hegel","doi":"10.1016/j.supflu.2025.106814","DOIUrl":"10.1016/j.supflu.2025.106814","url":null,"abstract":"<div><div>In the last years, there has been an increasing use of eco-friendly lubricant options produced from renewable raw materials, which are less toxic to humans and ecosystems. As the demand for sustainable products rises, lubricants derived from vegetable oils and animal fats are gaining attraction. In this study, we evaluate the purification of a biolubricant synthesized via classical alkali-catalyst esterification of fatty acid methyl esters (FAME) with trimethylolpropane (TMP) using CO<sub>2</sub> as solvent media. Unlike conventional purification solvents, using CO<sub>2</sub> minimizes environmental impact and aligns with green chemistry principles. We investigate the purification and upgrading of the filtrated biolubricant (28 wt% FAME) using CO<sub>2</sub> -both in its liquid and supercritical states- as a green solvent for designing a more sustainable separation process. The study examines phase equilibria of the multicomponent mixture (liquid-liquid-vapor to liquid-vapor phase transition), solubility of biolubricant in CO<sub>2</sub> (8.0–22.4 mg/g biolubricant/CO<sub>2</sub> according to operating conditions) and the purification process. The final bio-based base oils are analyzed to determine their FAME content, viscosity, and viscosity index. Results show that purified bio-based base oils contain as little as 2.9 wt% FAME, with a viscosity of 0.051 Pa.s at 313.2 K and a viscosity index of 196, comparable to those of the trimethylolpropane triolein standard. These findings suggest that the bio-based base oils produced and purified are suitable for lubrication applications, matching or exceeding the quality of conventional lubricants.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106814"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solvent effects on kinetics of hydrolysis reactions in supercritical water 溶剂对超临界水中水解反应动力学的影响

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-09 DOI: 10.1016/j.supflu.2025.106798

Akira Yoko , Mitsuru Sasaki , Tadafumi Adschiri

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Multilayer integrated design for frequency-tunable silicone rubber-based electromagnetic shielding foams 频率可调硅橡胶基电磁屏蔽泡沫的多层集成设计

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-15 DOI: 10.1016/j.supflu.2025.106818

Zuoze Fan, Xiaohan Wang, Bo Wang, Yishen Zhao, Ruyun Xu, Guangxian Li, Xia Liao

{"title":"Multilayer integrated design for frequency-tunable silicone rubber-based electromagnetic shielding foams","authors":"Zuoze Fan, Xiaohan Wang, Bo Wang, Yishen Zhao, Ruyun Xu, Guangxian Li, Xia Liao","doi":"10.1016/j.supflu.2025.106818","DOIUrl":"10.1016/j.supflu.2025.106818","url":null,"abstract":"<div><div>The integrated preparation strategy of multi-layer foam materials is expected to meet the demand for frequency-selective electromagnetic shielding properties. In this study, a synergistic regulation strategy of magnetic field and supercritical CO<sub>2</sub> foaming technology was employed to achieve the parallel alternate arrangement of conductive layers and porous layers. The impact of the layered cell structure in liquid silicone rubber/ ferrosoferric oxide modified graphene/ carbon nanotube (LSR/Fe<sub>3</sub>O<sub>4</sub>@G/CNT) on the electromagnetic shielding performance in the X-band (8.4 GHz–12.4 GHz) was systematically investigated. The results demonstrate that the electromagnetic shielding effectiveness (<em>SE</em><sub>T</sub>) of the unfoamed material remained stable at 11.4 dB. In contrast, the layered foam material exhibited frequency-selective electromagnetic shielding characteristics and the maximum <em>SE</em><sub>T</sub> reaching 33.4 dB after foaming. By adjusting the foaming parameters, the position of the shielding peak can be effectively regulated, enabling the multi-layered silicone rubber foam to achieve high shielding efficiency within specific frequency bands.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106818"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145364355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of CO2-philic surfactant on adhesion behavior and foamability of thermoplastic polyurethane (TPU) in water-free foaming process 亲二氧化碳表面活性剂对热塑性聚氨酯（TPU）无水发泡过程中粘附性能和发泡性能的影响

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-10 DOI: 10.1016/j.supflu.2025.106836

Yao Peng , Wenyu Zhong , Weizhong Zheng , Dongdong Hu , Xiaojia Wang , Jiayang Sun , Xinyu Zhuo , Yichong Chen , Ling Zhao

{"title":"Effect of CO2-philic surfactant on adhesion behavior and foamability of thermoplastic polyurethane (TPU) in water-free foaming process","authors":"Yao Peng , Wenyu Zhong , Weizhong Zheng , Dongdong Hu , Xiaojia Wang , Jiayang Sun , Xinyu Zhuo , Yichong Chen , Ling Zhao","doi":"10.1016/j.supflu.2025.106836","DOIUrl":"10.1016/j.supflu.2025.106836","url":null,"abstract":"<div><div>Carbon dioxide (CO<sub>2</sub>) water suspension foaming can produce complex special-shaped components foamed products with microcellular and low-density bead foams. The traditional water suspension foaming process has wastewater, complexity, high energy consumption, and hydrolysable polymer degradation. Based on the above problems, the water-free bead foaming process in spouted bed is developed, which has simple process and high efficiency. However, due to the differences in molecular structure of different polymers and the different plasticization effect of CO<sub>2</sub> on polymers, there are differences in the adhesion behavior of polymer beads in the foaming process. In this work, thermoplastic polyurethane (TPU) beads were selected as raw materials, and the effects of different CO<sub>2</sub>-philic surfactants on the adhesion and foaming behavior of TPU beads were investigated. Molecular dynamics (MD) simulations and experiments showed perfluorooctanoic acid (PFOA) can inhibit the adhesion of TPU foamed beads. Under 4 wt% PFOA, non-adhered TPU foamed beads with expansion ratio is 10.75, cell size is 49.83 μm and cell density is 4.30 × 10<sup>7</sup> cells/cm<sup>3</sup> can be prepared. Then, the shrinking TPU foamed beads are foamed twice by nitrogen (N<sub>2</sub>), and expansion ratio is over 14 times, cell size is 60.06 μm, and cell density is 5.23 × 10<sup>7</sup> cells/cm<sup>3</sup>. Through this method, achieving non-adhered TPU foamed beads characterized by high expansion ratio, high cell density, and small cell size. Finally, PFOA was efficiently recovered and reused via flash evaporation, achieving a recovery ratio exceeding 97.69 %. It’s worthy that minor losses may still present environmental and health concerns.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106836"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145485488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of drug-containing chitosan gels based on CO2-induced pH switching 基于co2诱导pH开关的含药壳聚糖凝胶的制备

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-12 DOI: 10.1016/j.supflu.2025.106839

Hiroaki Matsukawa, Yasue Matsuoka, Yuko Nakamoto, Katsuto Otake

{"title":"Preparation of drug-containing chitosan gels based on CO2-induced pH switching","authors":"Hiroaki Matsukawa, Yasue Matsuoka, Yuko Nakamoto, Katsuto Otake","doi":"10.1016/j.supflu.2025.106839","DOIUrl":"10.1016/j.supflu.2025.106839","url":null,"abstract":"<div><div>The solubilization of poorly water-soluble drugs is a key challenge for ensuring drug effectiveness. One approach is to complex water-soluble polymers with drugs. In this study, we focused on ionic interactions between a polymer and a drug as a novel complexation method. A cationic polymer, chitosan, was used as the polymer, and an anionic drug, indomethacin, was used as the drug. The solubilization of chitosan in water requires acidic conditions. Therefore, we utilized pH switching induced by the introduction of carbon dioxide to adjust the pH in a manner harmless to the human body. This method made it possible to reduce the use of organic solvents harmful to the human body. Using this strategy, a chitosan gel loaded with indomethacin was obtained. Under the preparation conditions of this study, approximately 5.0 mg/mL of indomethacin was dispersed by forming a complex with chitosan. This represents approximately 2000 times greater dispersion compared to its original saturation solubility in water. Furthermore, changing the preparation temperature altered the dispersibility of the loaded drug, and amide bonds were formed between chitosan and indomethacin at higher temperatures, resulting in an uneven gel. As amide bonds have been shown to inhibit drug release, gel formation at an appropriate preparation temperature is necessary to minimize amide bond formation. The dissolution test results showed that the dissolution rate of the drug in the complex increased by approximately 60–200 % compared to that of indomethacin alone. This study demonstrates a new method for solubilizing poorly water-soluble anionic drugs using chitosan.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106839"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145515656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of LC3 and traditional SCM-blended cement pastes under supercritical CO2 exposure 超临界CO2作用下LC3与传统scm混合水泥浆的比较

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-04 DOI: 10.1016/j.supflu.2025.106832

Kristína Compeľová , Jiří Másilko , Jozef Švorec , Peter Peciar , Eva Kuzielová

{"title":"Comparison of LC3 and traditional SCM-blended cement pastes under supercritical CO2 exposure","authors":"Kristína Compeľová , Jiří Másilko , Jozef Švorec , Peter Peciar , Eva Kuzielová","doi":"10.1016/j.supflu.2025.106832","DOIUrl":"10.1016/j.supflu.2025.106832","url":null,"abstract":"<div><div>Carbonation of cementitious materials is a critical issue affecting the long-term performance of geothermal wells. This study compares the resistance of limestone calcined clay cements (LC<sup>3</sup>) and traditional SCM-based (silica fume and metakaolin) cement pastes exposed to supercritical CO<sub>2</sub> for 7 days. The extent of carbonation and the associated phase transformations resulting from carbonation reactions were assessed using TGA, XRD, FTIR, and SEM-EDX analyses. Additionally, bulk density and compressive strength tests were conducted to evaluate the mechanical properties. The results demonstrated that the LC<sup>3</sup> composition exhibited superior resistance to carbonation compared to the mixtures incorporating silica fume and metakaolin at an equivalent level of cement replacement. Higher carbonation penetration in traditional SCM-based systems is evidenced by up to 52 % higher carbonate contents in the middle part of the samples. This enhanced carbonation is attributed to the limited portlandite buffering capacity. In the middle part of the sample, LC3–70 contained up to 55 % more portlandite, indicating both reduced carbonation and lower pozzolanic reactivity of the calcined clay and limestone compared to SF/MK mixtures. Higher portlandite content in LC<sup>3</sup> favoured more extensive carbonation-induced densification of the pore structure, effectively impeding CO<sub>2</sub> ingress. In addition, this process contributed to an increase in compressive strength, which reached 53 MPa, approximately 34 % higher than that of the corresponding composition cured under standard water-hydration conditions. For highly carbonated SF/MK samples, compressive strength increased by 77 % reaching up to 93 MPa.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106832"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145441993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0